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    <title>积分符号</title>
    <style type="text/css">
        .style1, .style2 {
            border: 0px;
            padding: 0px;
            margin: 4px;
        }
        .style2, .style2 .style1 {
            cursor: text;
            font-family: Symbola, "Times New Roman", serif;
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        .style2 {
            font-variant: normal;
            font-weight: normal;
            font-style: normal;
            font-size: 115%;
            line-height: 1;
            display: -moz-inline-box;
            display: inline-block;
        }

        .style1 {
            display: -moz-inline-box;
            display: inline-block;
            white-space: pre-wrap;
        }

        .style2 big {
            font-size: 125%;
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        .style2 * {
            font-size: inherit;
            line-height: inherit;
            margin: 0;
            padding: 0;
            border-color: black;
            -webkit-user-select: none;
            -moz-user-select: none;
            user-select: none;
        }

        .style2, .style2 .style1 {
            cursor: text;
            font-family: Symbola, "Times New Roman", serif;
        }

        .style2 {
            font-variant: normal;
            font-weight: normal;
            font-style: normal;
            font-size: 115%;
            line-height: 1;
        }

        .style1 {
            white-space: pre-wrap;
        }

        .style2 sub.limit {
            vertical-align: -0.6em;
        }

        .style2 sup.limit, .style2 sub.limit, .style2 sup.nthroot, .style2 sub.nthroot {
            font-size: 80%;
        }

        .style2 .non-leaf, .style2 .scaled {
            display: -moz-inline-box;
            display: inline-block;
        }

        .style2 sup, .style2 sub {
            position: relative;
            font-size: 90%;
        }

        .numxia {
            margin-top: 0.3px;
        }

        #box_rel1 {
            position: absolute;
            left: 3px;
            top: -20px;
        }

        #box_rel2 {
            position: absolute;
            left: 9.3px;
            top: -20px;
        }

        #box_rel3 {
            position: absolute;
            left: 1.8px;
            top: -9px;
        }
    </style>
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<body>
    <div class="style1 style2" mathquill-block-id="1"><span class="textarea"></span><big mathquill-command-id="3" class="numxia">∫</big><sub class="non-leaf limit" mathquill-command-id="5" mathquill-block-id="7" style="left: -0em;"><span mathquill-command-id="6">0</span></sub><sup class="non-leaf limit"
        mathquill-command-id="9" mathquill-block-id="11" style="left: -0.5333333333333333em; margin-right: -0.3666666666666667em;"><var mathquill-command-id="10" id="box_rel1">t</var></sup>&nbsp;&nbsp;Edt</div>=
    <div class="style1 style2"
    mathquill-block-id="1"><span class="textarea"></span><big mathquill-command-id="3">∫</big><sub class="non-leaf limit" mathquill-command-id="5" mathquill-block-id="7" style="left: -0.25em;"><span mathquill-command-id="6" id="box_rel3">0</span></sub><sup class="non-leaf limit"
        mathquill-command-id="9" mathquill-block-id="11" style="left: -0.5333333333333333em; margin-right: -0.3666666666666667em;"><var mathquill-command-id="10" id="box_rel2">x</var></sup>&nbsp;&nbsp;pdx</div>
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